156404001 has 16 divisors (see below), whose sum is σ = 225243200. Its totient is φ = 95964480.

The previous prime is 156403997. The next prime is 156404057. The reversal of 156404001 is 100404651.

It is not a de Polignac number, because 156404001 - 2² = 156403997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (156403001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7866 + ... + 19356.

It is an arithmetic number, because the mean of its divisors is an integer number (14077700).

Almost surely, 2^156404001 is an apocalyptic number.

It is an amenable number.

156404001 is a deficient number, since it is larger than the sum of its proper divisors (68839199).

156404001 is a wasteful number, since it uses less digits than its factorization.

156404001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11856.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 156404001 is about 12506.1585229038. The cubic root of 156404001 is about 538.7855664563.

Adding to 156404001 its reverse (100404651), we get a palindrome (256808652).

The spelling of 156404001 in words is "one hundred fifty-six million, four hundred four thousand, one".